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Hi Mumbles 🙂
If I get a chance tomorrow maybe I can take a couple of pictures that make sense after I service the snowblower and check my skis (season’s coming!!!). I’ve got an old HD apart in the garage. The two drilled holes provide the pressure relief for the exhaust which travels in the outer casing. The block drains coolant through a short tube on the flange assembly into the outer casing as well. The hex bolt goes straight through the outer casing and holds the inner casing around the drive shaft in place. The top of the inner casing slides up into the flange assembly so there isn’t anywhere for the water to enter the inner casing. The hole in the bolt goes through the center and only drains the inner casing.
Kev